Amplifier



FIG. 1 is a perspective view of an amplifier showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a front elevational view thereof, which is a mirror image of the rear elevational view thereof.

The broken line showing on FIGS. 1-5 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an amplifier, as shown and described. 